Ask HN: Is it always bad if a company does not grow?

Companies seem to always push employees to grow (get new business, hire more, repeat) above all else. But, what if a company functions perfectly fine at a given size -- that is, it's profitable, employees are content with their compensation and there is a clear path from entry level to advancement and ultimately retirement? What's wrong with just "sustaining" that size rather than stressing everyone out by seeking growth above all else?